Mack Brush Series 444 Virus II, buy thisScript and Scroll Brushes Available in 4 sizes Synthetic Softer Hair The Virus II is made of a soft golden synthetic hair. Designed by "Dave the Letterman" to appease the small crowd of painters who thought the original virus was a touch to stiff. So Mack Brush decided to make the brush with the same specifications as the original but with a golden synthetic hair that is a little softer. This brush will still be used for the same applications of scroll and script work. Individual Brushes LISTED BELOW!